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SUMMARY:Understanding the role of Chloride in Corrosion: DFT\, TEM and Mor
 phological Instabilities - Prof. Laurence Marks
DTSTART:20190503T140000Z
DTEND:20190503T150000Z
UID:TALK120514@talks.cam.ac.uk
CONTACT:Yonatan Calahorra
DESCRIPTION:It has been known for at least a century that chloride has a m
 ajor effect on corrosion\, often increasing\nthe rate of attack by an orde
 r of magnitude or more. This has serious consequences\, not just for\ncorr
 osion in sea water but also within humans\; they have similar chloride ion
  levels. The literature is full\nof conflicting models each developed with
  particular approaches focusing on one aspect of the problem\,\nrarely loo
 king at the larger picture.\nThe focus of this talk will be to show that t
 he different conflicting models are not in fact conflicting.\nDensity func
 tional theory calculations show that chloride plays a critical role in dis
 rupting the hydrogen\nbonding networks at oxide surfaces by replacing chem
 isorbed hydroxide. This leads to a reduction in the\nsurface free energy w
 hich promotes morphological instabilities\, these later conclusions being 
 supported\nby transmission electron microscopy and atom probe tomography r
 esults.
LOCATION:Goldsmiths 1\, Lecture Theatre\, Department of Materials Science 
 &amp\; Metallurgy
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